Helm of the Host

Oracle Text

At the beginning of combat on your turn, create a token that's a copy of equipped creature, except the token isn't legendary if equipped creature is legendary. That token gains haste.

Equip 5

Card Rulings

4/27/2018 The token copies exactly what was printed on the original creature and nothing else (unless that creature is copying something else or is a token; see below). It doesn’t copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.

4/27/2018 The token isn’t legendary, and this exception is copiable. If something else copies the token later, that copy also won’t be legendary. If you control two or more permanents with the same name but only one is legendary, the “legend rule” doesn’t apply.

4/27/2018 The token gains haste indefinitely, and this effect isn’t copiable. If something else copies the token later, that copy won’t have haste.

4/27/2018 If the copied creature has in its mana cost, X is considered to be 0.

4/27/2018 If the copied creature is a token, the token that’s created copies the original characteristics of that token as stated by the effect that created that token.

4/27/2018 If the copied creature is copying something else (for example, if the copied creature is a Clone), then the token enters the battlefield as whatever that creature copied.

4/27/2018 Any enters-the-battlefield abilities of the copied creature will trigger when the token enters the battlefield. Any “as [this creature] enters the battlefield” or “[this creature] enters the battlefield with” abilities of the chosen creature will also work.

4/27/2018 If the equipped creature leaves the battlefield before the triggered ability of Helm of the Host resolves, or if there is no equipped creature, no token is created. However, if Helm of the Host leaves the battlefield while its triggered ability is on the stack, a token will be created of the creature it last equipped. If that creature has also left the battlefield, its last known information is used to determine what the token looks like.

It creates infinite combat steps with Aurelia, the Warleader and Combat Celebrant both. Also, the tokens don't go away at the end of the turn as they usually do with other similar cards. Two card combos that can end the game right away are always worth keeping an eye on.

You don't need Aurelia to survive the attack, or the Combat Celebrant for that matter. Since the helm will churn a copy every new combat step, you need only to attack with the token, and eventually your opponent will go down, as eventually they'll run out of blockers and/or lifepoints. Propaganda effects can be nasty, but Crawlspace won't help much. You just need the token to connect with something.

You don't need Aurelia to survive the attack, or the Combat Celebrant for that matter. Since the helm will churn a copy every new combat step, you need only to attack with the token, and eventually your opponent will go down, as eventually they'll run out of blockers and/or lifepoints. Propaganda effects can be nasty, but Crawlspace won't help much. You just need the token to connect with something.

I was going to say it could cause a stalemate since the helm is not an optional trigger, but I suppose the extra attack step triggers are dependent on you choosing to swing with them. Make Aurelia survive her attack and then let the "arbitrarily large" number of clones swing out. Or just kill them by having Purpheros out if they're behind a crawlspace or propaganda effect.